<!DOCTYPE html>
<html>

<head>
    <meta http-equiv="Content-type" content="text/html; charset=utf-8" />
    <title></title>
    <style>
    .left {
        width: auto;
        height: 350px;
    }
    
    .left div {
        width: 350px;
        height: 150px;
        padding: 5px;
        margin: 5px;
        float: left;
        background: #bbffaa;
        border: 1px solid #ccc;
    }
    
    span {
        color: blue;
    }
    </style>
    <script src="http://lib.sinaapp.com/js/jquery/1.9.1/jquery-1.9.1.min.js"></script>
</head>

<body>
    <h2>parents方法()</h2>
    <div class="left first-div">

        <div class="div">
            <ul class="level-2">
                <!-- A -->
                <li class="item-a">A</li>
                <!-- B -->
                <li class="item-b">B
                    <ul class="level-3">
                        <li class="item-1">1</li>
                        <li class="item-2">2</li>
                        <li class="item-3">3</li>
                    </ul>
                </li>
                <!-- C -->
                <li class="item-c">C</li>
            </ul>
        </div>

        <div class="div">
            <ul class="level-2">
                <!-- A -->
                <li class="item-a">A</li>
                <!-- B -->
                <li class="item-b">B
                    <ul class="level-3">
                        <li class="item-1">1</li>
                        <li class="item-2">2</li>
                        <li class="item-3">3</li>
                    </ul>
                </li>
                <!-- C -->
                <li class="item-c">C</li>
            </ul>
        </div>

    </div>

    <button>点击：parents无参数</button>
    <button>点击：parents传递选择器</button>

    <script type="text/javascript">
    $("button:first").click(function() {
        $(".item-b").parents().css("border","1px solid red");
    })
    </script>

    <script type="text/javascript">
    $("button:last").click(function() {
        //找到当前元素的所有祖辈元素,筛选出class="first-div"的元素
        //并且附上一个边
        $('.item-b').parents('.first-div').css('border', '2px solid blue')
    })
    </script>
</body>

</html>

